ProSource TF Liquid Protein, 1.5 oz. Packets, 40 Calories.ProSource TF Liquid Protein is designed for tube feeding administration to meet the protein needs for critical illness, protein energy malnutrition and protein deficiency with good GI tolerance and greater patient application. ProSource TF contains 11 grams of complete protein and has a PDCAAS score of 100. The water thin consistency of ProSource TF makes enteral administration easy with no need for dilution and no sticky mess.